双波长光度法测定水中铜锌的含量  

Simultaneous Determinantion of Copper and Zinc in Water by Dual-wavelength Spectrophotometric

作　　者：李娟[1] 王丽[1] 

机构地区：[1]绵阳师范学院化学与化学工程学院,四川绵阳621000

出　　处：《绵阳师范学院学报》2016年第5期51-54,共4页Journal of Mianyang Teachers＇ College

摘　　要：建立了一种以双波长光度法同时测定水中铜锌含量的分析方法 .以铬黑T（EBT）为显色剂,十六烷基三甲基溴化铵（CTMAB）为增敏剂,通过试验确定了最佳实验条件.结果表明,在p H=9的硼酸-氯化钾-氢氧化钠缓冲溶液体系中,铜与锌都能与铬黑T显色剂形成稳定的紫红色络合物.铜络合物和锌络合物在540 nm处的摩尔吸收系数分别为15 284 L·（mol·cm）-1,16 438 L·（mol·cm）-1,都在0~1.2 mg·L-1遵循比尔定律.An analytic method of dual- wavelength Spectrophotometry to simultaneously determine the copper and zinc content in water was established. In the experiments with Eriochrome black T（ short as EBT） as chromogenic agent and CTMAB as sensitizer,the optimum experimental conditions were confirmed. Results showed that in the presence of H2B4O7- KCl- Na OH medium at p H = 9 and the surfactant CTMAB,Cu（ II） and Zn（ II） react simultaneously with EBT forming the respective complexes Cu- R（ λMAX= 531 nm） and Zn- R（ λMAX= 547 nm）.The amount of Cu（ II） and Zn（ II） were determined at wavelength of 540 nm isosbestic point,which the molar absorbtion coefficient,respectively 15 284 L·mol- 1and 16 438 L·mol- 1in 0 ~ 1. 2 mg·L- 1,followed beer＇s law.

关 键 词：双波长光度法 铬黑T CTMAB 铜 锌 

分 类 号：O657.32[理学—分析化学]